Refrigerating system with low steam consumption and control method

Abstract

The invention discloses a refrigerating system with low steam consumption and a control method.The system comprises an absorption refrigerating unit and a steam temperature and pressure reduction station, the steam temperature and pressure reduction station comprises atomization cooling equipment and a pressure reduction automatic valve, and the atomization cooling equipment is arranged on a pipeline section between a steam inlet of the absorption refrigerating unit and steam supply equipment; the atomization cooling equipment is used for cooling and adjusting the steam in the pipeline to the target steam temperature under the condition that the steam supply temperature of the steam supply equipment exceeds the target steam temperature; the pressure reduction automatic valve is arranged on a pipeline section between the atomization cooling equipment and a steam inlet of the absorption refrigerator, and is used for reducing the pressure of steam in a pipeline to the target steam pressure under the condition that the steam supply pressure provided by the steam supply equipment exceeds the target steam pressure; accurate control over the temperature and pressure of the external heat source steam is achieved, the cooling effect is more stable, and waste of the heat source steam is reduced.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration, and in particular to a refrigeration system with low steam consumption and a control method. Background Art

[0002] Lithium bromide refrigeration unit is a kind of equipment that uses lithium bromide solution as absorbent and water as refrigerant to achieve refrigeration by using heat energy. Lithium bromide refrigeration unit has the advantages of stable operation, low noise and easy maintenance, and is widely used in the field of coal chemical industry.

[0003] However, the cooling effect of lithium bromide refrigeration units during the cooling process depends largely on the heat source, and the cooling effect is often unstable or steam is wasted. Summary of the invention

[0004] The present invention provides a refrigeration system with low steam consumption and a control method, so as to realize accurate control of the temperature and pressure of external heat source steam, improve the stability of cooling effect and reduce the waste of heat source steam.

[0005] According to one aspect of the present invention, there is provided a refrigeration system with low steam consumption, characterized in that it comprises: a steam desuperheating and decompression station and at least one absorption refrigeration machine;

[0006] The absorption refrigeration machine comprises an automatic steam valve arranged at the steam inlet, and the automatic steam valve is used to adjust the amount of steam connected to the absorption refrigeration machine at the steam inlet according to the water temperature at the cold water return port;

[0007] The steam cooling and pressure reduction station includes an atomizing cooling device and an automatic pressure reducing valve. The atomizing cooling device is arranged in the pipeline section between the steam inlet of the absorption refrigerator and the steam supply device. The atomizing cooling device is used to cool the steam in the pipeline to the target steam temperature when the steam supply temperature of the steam supply device exceeds the target steam temperature; the automatic pressure reducing valve is arranged in the pipeline section between the atomizing cooling device and the steam inlet of the absorption refrigerator. The automatic pressure reducing valve is used to reduce the pressure of the steam in the pipeline to the target steam pressure when the steam supply pressure provided by the steam supply device exceeds the target steam pressure.

[0008] Optionally, the atomizing and cooling equipment comprises: a desalted water tank, a desalted water pump, a desalted water automatic valve and an atomizing and cooling nozzle;

[0009] The desalted water tank is used for temporarily storing desalted water from an external line; the desalted water pump and the desalted water automatic valve are arranged on the pipeline between the outlet of the desalted water tank and the atomizing cooling nozzle, and are used to control the flow rate of the desalted water delivered to the atomizing cooling nozzle; the atomizing cooling nozzle is arranged in the pipeline between the steam inlet of the absorption refrigeration machine and the steam supply equipment, and is used to atomize and spray desalted water into the pipeline to cool the steam in the pipeline.

[0010] Optionally, the low steam consumption refrigeration system further comprises: a cooling tower, a refrigeration circulation water pool and a refrigeration circulation water pump;

[0011] The cooling tower is arranged on the refrigeration circulating water pool and connected to the circulating water outlet of the absorption chiller; the refrigeration circulating water pool is connected to the circulating water inlet of the absorption chiller via the refrigeration circulating water pump;

[0012] The cooling tower is used to control the water temperature at the outlet of the refrigeration circulating water pump to a preset circulating water temperature.

[0013] Optionally, the cooling tower comprises: a tower body, a fan, a material distribution nozzle and at least two filler layers;

[0014] The tower cover is arranged on the refrigeration circulation water pool, and a refrigeration cavity is formed between the tower cover and the refrigeration circulation water pool;

[0015] The fan is arranged at the steam outlet at the top of the tower body, and is used to discharge hot steam to the outside of the tower to cool the circulating water;

[0016] The material distribution nozzle is arranged on the inner wall of the tower body, the material distribution nozzle is connected to the circulating water outlet of the absorption refrigeration machine, and the material distribution nozzle is used to evenly spray the circulating water discharged from the circulating water outlet of the absorption refrigeration machine into the tower body;

[0017] Each of the packing layers is sequentially arranged at different heights between the material distribution nozzle and the refrigeration circulation water pool inside the tower body.

[0018] Optionally, the preset circulating water temperature is equal to 25°C.

[0019] Optionally, the low steam consumption refrigeration system further includes: a low temperature water tank, a low temperature water pump, a sensor component group and a central control device;

[0020] The water outlet of the low-temperature water tank is connected to the cold water return port of the absorption refrigerator via the low-temperature water pump, and each cold water user device of the absorption refrigerator is connected in parallel between the cold water output port of the absorption refrigerator and the water inlet of the low-temperature water tank;

[0021] The sensor device group includes a total flow meter, a sub-flow meter and a sub-thermometer corresponding to each user device. The total flow meter is arranged between the low-temperature water pump and the cold water return port of the absorption chiller, and is used to detect the total cold water flow fed back by the low-temperature water pump to the absorption chiller; the sub-flow meter is arranged at the cold water inlet corresponding to the user device, and is used to detect the cold water flow provided by the corresponding absorption chiller to the user device; the sub-thermometer is arranged at the cold water outlet corresponding to the user device, and is used to detect the cold water temperature after use by the user device;

[0022] The central control device is respectively connected to the total flow meter, the sub-flow meter, the sub-thermometer and each of the user devices, and is used to adjust the water flow of each of the user devices according to the sensor data of at least one of the total flow meter, each of the sub-flow meters and each of the sub-thermometers.

[0023] Optionally, the target steam temperature is 200° C., and the target steam pressure is 0.47 MPa.

[0024] According to another aspect of the present invention, there is provided a refrigeration control method with low steam consumption, which is implemented by using any of the refrigeration systems with low steam consumption described in the previous aspect;

[0025] The low steam consumption refrigeration control method comprises:

[0026] Adjust the valve position of the automatic steam valve according to the water temperature at the cold water return port;

[0027] In the process of adjusting the valve position, obtain the steam supply temperature and steam supply pressure of the steam supply equipment;

[0028] When the steam supply temperature exceeds the target steam temperature, the atomizing cooling device is controlled to cool the steam in the pipeline to the target steam temperature;

[0029] When the steam supply temperature fails to reach the target steam temperature, feeding back the insufficient steam temperature to the energy and environmental protection center to increase the steam supply temperature of the steam supply equipment;

[0030] When the steam supply pressure exceeds the target steam pressure, the automatic pressure reducing valve is controlled to reduce the steam pressure in the pipeline to the target steam pressure;

[0031] In the case that the steam supply pressure fails to reach the target steam pressure, the insufficient steam pressure is fed back to the energy and environmental protection center to increase the steam supply pressure of the steam supply equipment.

[0032] Optionally, the low steam consumption refrigeration control method further includes:

[0033] In the process of adjusting the valve position, the water temperature at the outlet of the refrigeration circulation water pump is controlled at the preset circulation water temperature.

[0034] Optionally, the refrigeration control method with low steam consumption further includes:

[0035] In the process of adjusting the valve position, the sensor data of the total flow meter, each sub-flow meter and each sub-thermometer are obtained;

[0036] The water flow rate of each user device is adjusted according to the sensing data of at least one of the total flow meter, each sub-flow meter and each sub-thermometer.

[0037] The embodiment of the present invention provides a refrigeration system and control method with low steam consumption, wherein the system is provided with a steam temperature reduction and pressure reduction station and at least one absorption refrigeration machine. The absorption refrigeration machine includes an automatic steam valve arranged at the steam inlet, and the automatic steam valve is used to adjust the amount of steam connected to the absorption refrigeration machine at the steam inlet according to the water temperature at the cold water return port. The steam temperature reduction and pressure reduction station includes an atomizing cooling device and an automatic pressure reduction valve, wherein the atomizing cooling device is arranged at the pipeline section between the steam inlet of the absorption refrigeration machine and the steam supply device, and the atomizing cooling device is used to adjust the steam in the pipeline to the target steam temperature when the steam supply temperature of the steam supply device exceeds the target steam temperature; the automatic pressure reduction valve is arranged at the pipeline section between the atomizing cooling device and the steam inlet of the absorption refrigeration machine, and the automatic pressure reduction valve is used to adjust the steam in the pipeline to the target steam pressure when the steam supply pressure provided by the steam supply device exceeds the target steam pressure, thereby realizing accurate control of the temperature and pressure of the steam from the external heat source, making the cooling effect more stable and reducing the waste of the heat source steam.

[0038] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a lithium bromide refrigerator in the prior art;

[0041] Figure 2 A schematic diagram of the composition of a low steam consumption refrigeration system provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of another low steam consumption refrigeration system provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the principle of steam adjustment provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of another low steam consumption refrigeration system provided by an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the principle of circulating water temperature adjustment provided by an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of the composition of a circulating water flow device provided by an embodiment of the present invention;

[0047] Figure 8 A schematic diagram of the composition of another low steam consumption refrigeration system provided by an embodiment of the present invention;

[0048] Fig. 9 A schematic flow chart of a refrigeration control method with low steam consumption provided by an embodiment of the present invention;

[0049] Fig.10 A schematic flow chart of another refrigeration control method with low steam consumption provided by an embodiment of the present invention;

[0050] Fig.11 A schematic diagram of the structure of an electronic device that can be used to implement an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] As mentioned in the background technology, a lithium bromide refrigeration unit is a device that uses lithium bromide solution as an absorbent and water as a refrigerant to achieve refrigeration using thermal energy. Figure 1 The working principle of the lithium bromide refrigerator in the prior art can be briefly described as follows: in the generator, an external heat source heats the lithium bromide solution, causing the water in the solution to evaporate and form refrigerant water vapor. The refrigerant water vapor enters the condenser and is cooled and condensed into liquid water. After throttling and pressure reduction, the liquid water enters the evaporator, where it absorbs external heat and evaporates, thereby producing a refrigeration effect. The evaporated refrigerant water vapor is absorbed by the lithium bromide solution in the absorber, re-forming a concentrated solution, which is then pumped back to the generator by the solution pump to complete the entire cycle.

[0054] Reference Figure 1 In the cooling process, the cooling effect of the lithium bromide refrigeration unit will largely rely on the heat source water, that is, the external steam used to heat the generator, and the cooling effect is often unstable or the steam is wasted. The inventor has found that the refrigeration effect of the lithium bromide refrigeration unit is closely related to the steam supply. The external steam is mainly used as a heat source to heat the lithium bromide solution in the high-pressure generator, prompting the water in the solution to evaporate and form refrigerant water vapor. Parameters such as the temperature, pressure and flow of the external steam will directly affect the heating effect in the high-pressure generator. If the steam temperature is high, the pressure is large and the flow is sufficient, the heating effect of the solution in the high-pressure generator will be better, and the water can be more effectively evaporated, thereby generating more refrigerant water vapor and enhancing the refrigeration effect of the lithium bromide refrigeration unit. However, if the steam supply is excessive and exceeds the maximum amount of the refrigerator, it will often cause steam waste. On the contrary, if the steam temperature is low, the pressure is low or the flow is insufficient, the heating effect of the generator will be poor, the amount of water evaporation will be reduced, and the amount of refrigerant water vapor generated will decrease, which will lead to a poor refrigeration effect. Unstable steam supply (also called heat source supply) will cause unstable operation of the refrigeration unit, thus affecting the uniformity and reliability of the cooling effect.

[0055] Based on this, an embodiment of the present invention proposes a refrigeration system with low steam consumption. Figure 2 A schematic diagram of a low steam consumption refrigeration system provided by an embodiment of the present invention, referring to Figure 2 The low steam consumption refrigeration system 200 includes a steam temperature and pressure reduction station 201 and an absorption refrigeration unit 202 including at least one absorption refrigeration machine 203. In this embodiment, the absorption refrigeration unit 202 includes four absorption refrigeration machines 203. The absorption refrigeration machine 203 includes an automatic steam valve k1 disposed at the steam inlet, and the automatic steam valve k1 is used to adjust the amount of steam connected to the absorption refrigeration machine 203 at the steam inlet according to the water temperature at the cold water return port. The steam cooling and pressure reduction station 201 includes an atomizing cooling device 204 and an automatic pressure reducing valve k2. The atomizing cooling device 204 is arranged in the pipeline section between the steam inlet of the absorption refrigerator 203 and the steam supply device. The atomizing cooling device 204 is used to cool the steam in the pipeline to the target steam temperature when the steam supply temperature of the steam supply device exceeds the target steam temperature; the automatic pressure reducing valve k2 is arranged in the pipeline section between the atomizing cooling device 204 and the steam inlet of the absorption refrigerator 203. The automatic pressure reducing valve k2 is used to reduce the pressure of the steam in the pipeline to the target steam pressure when the steam supply pressure provided by the steam supply device exceeds the target steam pressure.

[0056] Specifically, the absorption refrigerator 203 is a refrigerator that relies on the absorber to cooperate with the generator group to complete the refrigeration cycle, uses a binary solution as a working fluid, and the low-boiling point component in the binary solution is used as a refrigerant, that is, the evaporation of the low-boiling point component is used for refrigeration, and the high-boiling point component is used as an absorbent, that is, the absorption of the refrigerant vapor by the high-boiling point component is used to complete the working cycle. For example, the absorption refrigerator 203 can be a lithium bromide absorption refrigerator 203, and a refrigeration unit can include multiple absorption refrigerators of the same model. The absorption refrigerator 203 includes an automatic steam valve k1 arranged at the steam inlet. The automatic steam valve k1 can control the steam flow rate entering the absorption chiller 203 from the steam inlet. The valve position of the automatic steam valve k1 is related to the water temperature of the cold water return port, wherein the cold water return port is the return interface corresponding to the user equipment on the absorption chiller 203, which can receive the cold water used by the user equipment and return it to the absorption chiller 203. By way of example, a temperature sensor device can be provided at the cold water return port to collect water temperature data at the cold water return port.

[0057] The steam temperature reduction and pressure reduction station 201 is a temperature reduction and pressure reduction component arranged on the pipeline section between the steam inlet of the absorption refrigeration machine 203 and the steam supply device, and can reduce the temperature and pressure of the steam about to enter the absorption refrigeration machine 203. The steam temperature reduction and pressure reduction station 201 includes an atomizing and cooling device 204 and a pressure reduction automatic valve k2. The atomizing and cooling device 204 can cool the steam by spraying a cooling liquid in the corresponding pipeline section, so as to prevent the heat source steam entering the absorption refrigeration machine 203 from exceeding the preset target steam temperature, so that the steam of the refrigeration machine is excessive and the steam is wasted. The target steam temperature can be set according to the basic parameters of the absorption refrigeration machine 203, such as the type, model, power, required steam temperature and steam utilization rate of the absorption refrigeration machine 203, and the refrigeration demand parameters of the user, and can also be determined according to the minimum steam temperature when the absorption refrigeration machine 203 reaches the maximum cooling power measured by multiple groups of experiments. Exemplarily, the atomization cooling device 204 can use desalted water to perform atomization spraying in the corresponding pipeline section, and adjust the temperature of the steam entering the absorption chiller 203 by controlling the start and stop of the brine and the spraying amount.

[0058] The pressure reducing automatic valve k2 is arranged in the pipeline section between the atomizing cooling device 204 and the steam inlet of the absorption refrigerator 203, and can automatically reduce the pressure in the pipeline section. When the steam supply pressure at the inlet exceeds the target steam pressure, the pressure of the steam inlet output to the absorption refrigerator 203 is automatically reduced to the target steam pressure, wherein the target steam pressure is set based on the target steam temperature, according to the basic parameters of the absorption refrigerator 203 such as the model, power, required steam pressure and steam utilization rate of the absorption refrigerator 203, and can also be determined based on the steam pressure when the absorption refrigerator 203 reaches the maximum cooling power when the steam temperature is the target steam temperature measured by multiple groups of experiments. Exemplarily, the pressure reducing automatic valve k2 can be a self-acting pressure reducing valve.

[0059] The low steam consumption refrigeration system provided in this embodiment is provided with a steam temperature reduction and pressure reduction station and at least one absorption refrigerator. The absorption refrigerator includes an automatic steam valve arranged at the steam inlet, and the automatic steam valve is used to adjust the amount of steam connected to the absorption refrigerator at the steam inlet according to the water temperature at the cold water return port. The steam temperature reduction and pressure reduction station includes an atomizing cooling device and a pressure reduction automatic valve, the atomizing cooling device is arranged in the pipeline section between the steam inlet of the absorption refrigerator and the steam supply device, and the atomizing cooling device is used to adjust the steam in the pipeline to the target steam temperature when the steam supply temperature of the steam supply device exceeds the target steam temperature; the pressure reduction automatic valve is arranged in the pipeline section between the atomizing cooling device and the steam inlet of the absorption refrigerator, and the pressure reduction automatic valve is used to adjust the steam in the pipeline to the target steam pressure when the steam supply pressure provided by the steam supply device exceeds the target steam pressure, thereby realizing accurate control of the temperature and pressure of the steam of the external heat source, making the cooling effect more stable and reducing the waste of the heat source steam.

[0060] Optionally, Figure 3 A schematic diagram of another low steam consumption refrigeration system provided by an embodiment of the present invention, Figure 4 A schematic diagram of the principle of steam adjustment provided by an embodiment of the present invention, based on the above-mentioned embodiment, combined with Figure 3 and Figure 4 The atomizing and cooling equipment 204 includes: a desalting water tank 301, a desalting water pump m1, a desalting water automatic valve k3 and an atomizing and cooling nozzle 302. The desalting water tank 301 is used to temporarily store the desalting water from the outside; the desalting water pump m1 and the desalting water automatic valve k3 are arranged on the pipeline between the outlet of the desalting water tank 301 and the atomizing and cooling nozzle 302, and are used to control the flow rate of the desalting water delivered to the atomizing and cooling nozzle 302; the atomizing and cooling nozzle 302 is arranged in the pipeline between the steam inlet of the absorption refrigeration machine 203 and the steam supply equipment, and is used to spray the desalting water into the pipeline to cool the steam in the pipeline.

[0061] Specifically, the atomizing cooling nozzle 302 is arranged in the pipeline between the steam inlet and the steam supply device of the absorption refrigeration machine 203, and can atomize the desalted water and spray it into the pipeline, thereby cooling the steam. The desalted water tank 301 refers to a temporary storage container for desalted water, and is provided with an inlet connected to the desalted water supply device of the external line and an outlet for internal supply, which can provide desalted water for the atomizing cooling nozzle 302. The desalted water pump m1 and the desalted water automatic valve k3 are sequentially arranged on the pipeline between the outlet of the desalted water tank 301 and the atomizing cooling nozzle 302. The desalted water pump m1 provides the transmission power of the desalted water, and the desalted water automatic valve k3 can adjust the flow rate of the desalted water. Exemplarily, the opening of the desalted water automatic valve k3 can be positively linked with the flow rate of the desalted water pump m1, and jointly adjust the water spraying amount of the atomizing cooling nozzle 302, so that the water spraying amount is related to the steam temperature, thereby playing a role in automatically and accurately controlling the temperature. Exemplarily, the desalted water automatic valve k3 and the desalted water pump m1 can be automatically opened when the real-time steam temperature is higher than the target steam temperature, and the opening of the desalted water automatic valve k3 and the flow rate of the desalted water pump m1 can change in a positive correlation with the temperature excess, wherein the temperature excess refers to the excess of the real-time steam temperature relative to the target steam temperature.

[0062] For example, on one hand, when the steam supply pressure of the steam supply equipment is greater than the target steam pressure of 0.47Mpa, the pressure reducing steam valve can reduce the steam pressure to 0.47Mpa, thereby reducing the steam usage. When the steam supply pressure of the steam supply equipment is less than the target steam pressure of 0.47Mpa, the central control equipment can notify the energy and environmental protection center to increase the steam supply pressure of the steam supply equipment, thereby reducing the consumption of steam supplied from the source, preventing the reduction of the refrigeration effect caused by insufficient steam, and stabilizing the refrigeration effect.

[0063] On the other hand, when the steam supply temperature of the steam supply equipment is greater than the target steam temperature of 200°C, the desalted water pump m1 and the desalted water automatic valve k3 of the steam desuperheating and decompression station 201 are both started, and the desalted water spraying amount of the atomizing cooling nozzle 302 is adjusted according to the excess of the steam supply temperature relative to the target steam temperature, so as to cool the steam to 200°C. The water in the sprayed desalted water can be over-vaporized into water vapor, so by spraying desalted water to cool down, the amount of steam supplied to the absorption refrigeration machine 203 can be increased on the basis of reducing the steam temperature, thereby reducing the consumption of steam supplied from the source and avoiding the waste of excessive steam use of the refrigeration unit. When the steam supply temperature of the steam supply equipment is less than the target steam temperature of 200°C, the desalted water pump m1 and the desalted water automatic valve k3 of the steam desuperheating and decompression station 201 are both kept closed, and the central control equipment can notify the energy and environmental protection center to increase the steam supply temperature of the steam supply equipment, thereby reducing the consumption of steam supplied from the source, preventing the reduction of the refrigeration effect caused by insufficient steam, and stabilizing the refrigeration effect.

[0064] Optionally, Figure 5A schematic diagram of another low steam consumption refrigeration system provided by an embodiment of the present invention, Figure 5 The illustration of each specific absorption refrigeration machine in the absorption refrigeration unit is omitted. Figure 6 A schematic diagram of the principle of adjusting the temperature of circulating water provided by an embodiment of the present invention is provided. Figure 5 The low steam consumption refrigeration system 200 further includes a cooling tower 501, a refrigeration circulating water pool 502 and a refrigeration circulating water pump m2. The cooling tower 501 is arranged on the refrigeration circulating water pool 502 and is respectively connected to the circulating water outlet of each absorption chiller; the refrigeration circulating water pool 502 is respectively connected to the circulating water inlet of each absorption chiller via the refrigeration circulating water pump m2. The cooling tower 501 is used to control the water temperature at the outlet of the refrigeration circulating water pump to a preset circulating water temperature.

[0065] Specifically, circulating water is cooling water used to cool down the water vapor in the condenser and absorber of the absorption chiller. The temperature of the circulating water entering the absorption chiller will also affect the refrigeration effect and the amount of external steam. The refrigeration circulating water pool 502 is used to temporarily store the circulating water. The cooling tower 501 is covered on the refrigeration circulating water pool 502 and connected to the circulating water outlet of the absorption chiller. The circulating water flowing out of the circulating water outlet through the inner wall of the cooling tower 501 can be cooled, and the circulating water in the refrigeration circulating water pool 502 can also be cooled, so that the water temperature at the outlet of the refrigeration circulating water pump is controlled to a preset circulating water temperature, wherein the preset circulating water temperature can be set according to the basic parameters of the absorption chiller such as the type, model, power, required steam temperature and steam utilization rate of the absorption chiller, and can also be determined according to the highest circulating water temperature when the absorption chiller reaches the maximum cooling power measured by multiple groups of experiments.

[0066] For example, Figure 7 A schematic diagram of a circulating water flow device provided by an embodiment of the present invention, combined with Figure 6 and Figure 7The cooling tower 501 includes a tower body 601, a fan 605, a material spray nozzle 603 and at least two layers of packing layers 602. The tower body 601 is covered on the refrigeration circulating water pool 502, and a refrigeration cavity is formed between the tower body 601 and the refrigeration circulating water pool 502. The fan 605 is arranged at the steam outlet 604 at the top of the tower body 601, and the fan 605 is used to discharge hot steam to the outside of the tower, so as to cool the circulating water flowing through the inner wall of the tower body, the seasoning layer and temporarily stored in the refrigeration circulating water pool 502. The material spray nozzle 603 is arranged on the inner wall of the tower body 601, and the material spray nozzle 603 is connected to the circulating water outlet of the absorption chiller. The material spray nozzle 603 is used to evenly spray the circulating water discharged from the circulating water outlet of the absorption chiller into the tower body 601. Each packing layer 602 is sequentially arranged at different heights between the material spray nozzle 603 and the refrigeration circulating water pool 502 inside the tower body 601. When it is detected that the water temperature at the outlet of the refrigeration circulation water pump m2 is lower than the preset circulation water temperature of 25°C, the speed of the motor 606 corresponding to the fan 605 is reduced, so that the water temperature at the outlet of the refrigeration circulation water pump m2 is restored to 25°C. On the one hand, it can prevent the waste caused by the excess cooling capacity of the circulating water and prevent the blockage of the cooling pipe. On the other hand, it can stabilize the refrigeration effect and reduce the consumption of the source-supplied steam. When it is detected that the water temperature at the outlet of the refrigeration circulation water pump m2 is higher than the preset circulation water temperature of 25°C, the speed of the fan motor is increased, so that the water temperature at the outlet of the refrigeration circulation water pump is restored to 25°C. On the one hand, it can prevent the reduction of the refrigeration effect caused by the insufficient cooling capacity of the circulating water. On the other hand, it can prevent the increase of the consumption of the source-supplied steam caused by the insufficient circulating water, thereby saving the consumption of the source-supplied steam.

[0067] Optionally, Figure 8 A schematic diagram of another low steam consumption refrigeration system provided in an embodiment of the present invention is provided. Based on the above embodiment, Figure 8The low steam consumption refrigeration system 200 also includes a low temperature water tank 801, a low temperature water pump 802, a sensor component group and a central control device (the central control device is not shown in the figure). The water outlet of the low temperature water tank 801 is connected to the cold water return port of the absorption refrigeration machine through the low temperature water pump 802, and each cold water user device of the absorption refrigeration machine is connected in parallel between the cold water output port of the absorption refrigeration machine and the water inlet of the low temperature water tank 801. The sensor component group includes a total flow meter v1, a sub-flow meter v2 and a sub-thermometer t2 corresponding to each user device. The total flow meter v1 is set between the low temperature water pump 802 and the cold water return port of the absorption refrigeration machine, and is used to detect the total cold water flow fed back to the refrigeration unit by the low temperature water pump 802; the sub-flow meter v2 is set at the cold water inlet of the corresponding user device, and is used to detect the cold water flow provided by the corresponding absorption refrigeration machine to the user device; the sub-thermometer t2 is set at the cold water outlet of the corresponding user device, and is used to detect the cold water temperature after use by the user device. The central control device is connected to the total flow meter v1, the sub-flow meter v2, the sub-thermometer t2 and each user device respectively. The central control device is used to adjust the water flow of each user device according to the sensor data of at least one of the total flow meter v1, each sub-flow meter v2 and each sub-thermometer t2.

[0068] Specifically, the low steam consumption refrigeration system 200 is applied to the coal chemical process flow, and provides cold water for cooling devices (also referred to as user equipment) such as the primary cooler, the fan oil station, the final cooling heat exchanger, the acid cooler, the desulfurization semi-rich liquid cooler, the desulfurization gas cooler, the crude benzene second-stage lean oil cooler and the crude benzene cooler. The central control device is the master controller of the low steam consumption refrigeration system 200, which can execute the low steam consumption refrigeration control method, and can also be connected to each user device, and according to the sensor data of at least one of the total flow meter v1, each sub-flow meter v2 and each sub-thermometer t2, the water flow of each user device is allocated. Exemplarily, the central control device can be at least one of a controller, a control chip, a single-chip microcomputer and a computer with data processing and control signal generation functions.

[0069] For example, Figure 8 The right side shows the cold water flow at the cold water inlet of each user device and the corresponding cold water temperature at the cold water outlet during normal use of low-temperature cold water. When the flow of any user in each user device increases, the flow at the outlet of the low-temperature water pump 802 also increases. When it reaches 1050m 3 / h flow rate and above, the temperature of the cold water entering the refrigeration unit increases. At this time, the unit needs to open the valve position of the automatic steam valve k1. The absorption chiller needs a larger amount of refrigerant steam, so the steam consumption increases. By setting up the monitoring of the water consumption of each user device, the central control device can transmit the number of the corresponding user device to the duty device and prompt it when a single point exceeds the preset flow range. The central control device reasonably adjusts the amount of cold water supplied to each user device according to the cold water volume and temperature of each user device and controls the total water volume unchanged. In the event of an abnormal increase in flow at each flow monitoring point, notify the on-site personnel to check and handle it. After it returns to normal, the central control device will reallocate according to the normal flow, so that the steam consumption of the absorption chiller will also be stabilized.

[0070] The embodiment of the present invention also provides a refrigeration control method with low steam consumption. Fig. 9 A flow chart of a refrigeration control method with low steam consumption provided by an embodiment of the present invention is provided. Based on the above-mentioned embodiment, the refrigeration control method with low steam consumption includes:

[0071] S901. Adjust the valve position of the automatic steam valve according to the water temperature at the cold water return port.

[0072] S902. In the process of adjusting the valve position, the steam supply temperature and the steam supply pressure of the steam supply equipment are obtained.

[0073] S903. When the steam supply temperature exceeds the target steam temperature, the atomizing cooling device is controlled to cool the steam in the pipeline to the target steam temperature.

[0074] S904. When the steam supply temperature fails to reach the target steam temperature, the insufficient steam temperature is fed back to the Energy and Environmental Protection Center to increase the steam supply temperature of the steam supply equipment.

[0075] S905. When the steam supply pressure exceeds the target steam pressure, the automatic pressure reducing valve is controlled to reduce the steam pressure in the pipeline to the target steam pressure.

[0076] S906. When the steam supply pressure fails to reach the target steam pressure, the insufficient steam pressure shall be fed back to the Energy and Environmental Protection Center to increase the steam supply pressure of the steam supply equipment.

[0077] The refrigeration control method with low steam consumption provided in this embodiment adjusts the valve position of the automatic steam valve according to the water temperature at the cold water return port. In the process of adjusting the valve position, the steam supply temperature and steam supply pressure of the steam supply equipment are obtained. When the steam supply temperature exceeds the target steam temperature, the atomizing cooling device is controlled to cool the steam in the pipeline to the target steam temperature. When the steam supply temperature does not reach the target steam temperature, the insufficient steam temperature is fed back to the energy and environmental protection center to increase the steam supply temperature of the steam supply equipment. When the steam supply pressure exceeds the target steam pressure, the pressure reducing automatic valve is controlled to reduce the pressure of the steam in the pipeline to the target steam pressure. When the steam supply pressure does not reach the target steam pressure, the insufficient steam pressure is fed back to the energy and environmental protection center to increase the steam supply pressure of the steam supply equipment, thereby achieving accurate control of the temperature and pressure of the external heat source steam, making the cooling effect more stable and reducing the waste of heat source steam.

[0078] Optionally, Fig.10 A flow chart of another low steam consumption refrigeration control method provided by an embodiment of the present invention. Based on the above embodiment, the low steam consumption refrigeration control method further includes:

[0079] S1001. In the process of adjusting the valve position, the water temperature at the outlet of the refrigeration circulation water pump is controlled at a preset circulation water temperature.

[0080] S1002. In the process of adjusting the valve position, the sensor data of the total flow meter, each sub-flow meter and each sub-thermometer are obtained.

[0081] S1003. Adjust the water flow rate of each user device according to the sensor data of at least one of the total flow meter, each sub-flow meter and each sub-thermometer.

[0082] The refrigeration control method with low steam consumption provided in this embodiment controls the water temperature at the outlet of the refrigeration circulation water pump to a preset circulation water temperature during the process of adjusting the valve position. During the process of adjusting the valve position, the sensing data of the total flow meter, each sub-flow meter and each sub-thermometer are obtained. According to the sensing data of at least one of the total flow meter, each sub-flow meter and each sub-thermometer, the water flow rate of each user device is adjusted, so as to realize the control of the circulation water temperature and the distribution monitoring of the cold water, further improve the stability of the cooling effect and reduce the waste of heat source steam.

[0083] Fig.11A schematic diagram of an electronic device that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0084] like Fig.11 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0085] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0086] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a refrigeration control method with low steam consumption.

[0087] In some embodiments, the refrigeration control method with low steam consumption can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the refrigeration control method with low steam consumption described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the refrigeration control method with low steam consumption in any other appropriate manner (for example, by means of firmware).

[0088] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0089] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0090] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0091] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0092] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0093] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0094] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0095] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigeration system with low steam consumption, characterized in that: include: Steam desuperheating and decompression station and at least one absorption chiller; The absorption refrigeration machine comprises an automatic steam valve arranged at the steam inlet, and the automatic steam valve is used to adjust the amount of steam connected to the absorption refrigeration machine at the steam inlet according to the water temperature at the cold water return port; The steam cooling and pressure reduction station includes an atomizing cooling device and an automatic pressure reducing valve. The atomizing cooling device is arranged in the pipeline section between the steam inlet of the absorption refrigerator and the steam supply device. The atomizing cooling device is used to cool the steam in the pipeline to the target steam temperature when the steam supply temperature of the steam supply device exceeds the target steam temperature; the automatic pressure reducing valve is arranged in the pipeline section between the atomizing cooling device and the steam inlet of the absorption refrigerator. The automatic pressure reducing valve is used to reduce the pressure of the steam in the pipeline to the target steam pressure when the steam supply pressure provided by the steam supply device exceeds the target steam pressure.

2. The refrigeration system with low steam consumption according to claim 1, characterized in that: The atomizing and cooling equipment comprises: a desalting water tank, a desalting water pump, a desalting water automatic valve and an atomizing and cooling nozzle; The desalted water tank is used for temporarily storing desalted water from an external line; the desalted water pump and the desalted water automatic valve are arranged on the pipeline between the outlet of the desalted water tank and the atomizing cooling nozzle, and are used to control the flow rate of the desalted water delivered to the atomizing cooling nozzle; the atomizing cooling nozzle is arranged in the pipeline between the steam inlet of the absorption refrigeration machine and the steam supply equipment, and is used to atomize and spray desalted water into the pipeline to cool the steam in the pipeline.

3. The refrigeration system with low steam consumption according to claim 1, characterized in that: Also includes: Cooling towers, refrigeration circulation water pools and refrigeration circulation water pumps; The cooling tower is arranged on the refrigeration circulating water pool and connected to the circulating water outlet of the absorption chiller; The refrigeration circulation water pool is connected to the circulation water inlet of the absorption refrigerator via the refrigeration circulation water pump; The cooling tower is used to control the water temperature at the outlet of the refrigeration circulating water pump to a preset circulating water temperature.

4. The refrigeration system with low steam consumption according to claim 3, characterized in that: The cooling tower comprises: a tower body, a fan, a material distribution nozzle and at least two filler layers; The tower cover is arranged on the refrigeration circulation water pool, and a refrigeration cavity is formed between the tower cover and the refrigeration circulation water pool; The fan is arranged at the steam outlet at the top of the tower body, and is used to discharge hot steam to the outside of the tower to cool the circulating water; The material distribution nozzle is arranged on the inner wall of the tower body, the material distribution nozzle is connected to the circulating water outlet of the absorption refrigeration machine, and the material distribution nozzle is used to evenly spray the circulating water discharged from the circulating water outlet of the absorption refrigeration machine into the tower body; Each of the packing layers is sequentially arranged at different heights between the material distribution nozzle and the refrigeration circulation water pool inside the tower body.

5. The refrigeration system with low steam consumption according to claim 3, characterized in that: The preset circulating water temperature is equal to 25°C.

6. The refrigeration system with low steam consumption according to claim 1, characterized in that: Also includes: Low temperature water tank, low temperature water pump, sensor component group and central control equipment; The water outlet of the low-temperature water tank is connected to the cold water return port of the absorption refrigerator via the low-temperature water pump, and each cold water user device of the absorption refrigerator is connected in parallel between the cold water output port of the absorption refrigerator and the water inlet of the low-temperature water tank; The sensor device group includes a total flow meter, a sub-flow meter and a sub-thermometer corresponding to each user device. The total flow meter is arranged between the low-temperature water pump and the cold water return port of the absorption chiller, and is used to detect the total cold water flow fed back by the low-temperature water pump to the absorption chiller; the sub-flow meter is arranged at the cold water inlet corresponding to the user device, and is used to detect the cold water flow provided by the corresponding absorption chiller to the user device; the sub-thermometer is arranged at the cold water outlet corresponding to the user device, and is used to detect the cold water temperature after use by the user device; The central control device is respectively connected to the total flow meter, the sub-flow meter, the sub-thermometer and each of the user devices, and is used to adjust the water flow of each of the user devices according to the sensor data of at least one of the total flow meter, each of the sub-flow meters and each of the sub-thermometers.

7. The refrigeration system with low steam consumption according to any one of claims 1 to 6, characterized in that: The target steam temperature is 200° C., and the target steam pressure is 0.47 MPa.

8. A refrigeration control method with low steam consumption, characterized in that: The method is implemented by using the refrigeration system with low steam consumption as described in any one of claims 1 to 7; The low steam consumption refrigeration control method comprises: Adjust the valve position of the automatic steam valve according to the water temperature at the cold water return port; In the process of adjusting the valve position, obtain the steam supply temperature and steam supply pressure of the steam supply equipment; When the steam supply temperature exceeds the target steam temperature, the atomizing cooling device is controlled to cool the steam in the pipeline to the target steam temperature; When the steam supply temperature fails to reach the target steam temperature, feeding back the insufficient steam temperature to the energy and environmental protection center to increase the steam supply temperature of the steam supply equipment; When the steam supply pressure exceeds the target steam pressure, the automatic pressure reducing valve is controlled to reduce the steam pressure in the pipeline to the target steam pressure; In the case that the steam supply pressure fails to reach the target steam pressure, the insufficient steam pressure is fed back to the energy and environmental protection center to increase the steam supply pressure of the steam supply equipment.

9. The refrigeration control method with low steam consumption according to claim 8, characterized in that: Also includes: In the process of adjusting the valve position, the water temperature at the outlet of the refrigeration circulation water pump is controlled at the preset circulation water temperature.

10. The refrigeration control method with low steam consumption according to claim 8, characterized in that: Also includes: In the process of adjusting the valve position, the sensor data of the total flow meter, each sub-flow meter and each sub-thermometer are obtained; The water flow rate of each user device is adjusted according to the sensing data of at least one of the total flow meter, each sub-flow meter and each sub-thermometer.

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